Abstract: The bimetallic material comprises a laminate of two materials, one having a high coefficient of thermal expansion, one with a low coefficient of thermal expansion. The material with the high coefficient of expansion is a corrosion resisting and heat resisting austenitic chromium-nickel steel, while the material with the low coefficient of expansion is a heat hardenable alloy of iron, nickel, cobalt and titanium and/or aluminium. It is found that this combination of materials gives rise to a bimetallic material capable of heavy duty applications without the disadvantages normally associated with such heavy duty materials.

Abstract: A valve for an internal combustion engine having a contact surface formed of an alloy which exhibits satisfactory wear properties, PbO corrosion resistance and oxidation resistance, and is less expensive than cobalt containing alloys used for the same purpose. The alloy contains carbon, preferably 1.4 to 2.0wt.%, molybdenum, preferably 4.0 to 6.0wt.%, silicon, preferably 0.1 to 1.0wt.%. nickel, preferably 8 to 13wt.%, chromium, preferably 20 to 26wt.%, manganese, preferably 0 to 3.0wt.%, with the balance being iron.

Abstract: An alloy-coated ferrous metal substrate is disclosed, the ferrous metal making up said substrate having a thermal conductivity relative to silver taken as 1 cal./sq.cm/cm/.degree. C/sec at substantially ambient temperature of at least about 0.06, the alloy coating being selected from the group consisting of a self-fluxing heat and corrosion resistant iron-group metal-base alloy and a self-fluxing copper-base alloy fused and metallurigically bonded to said ferrous metal substrate, said alloy coating having a thickness of about 0.005 to 0.15 inch, the thermal conductivity of said coating being at least about 0.05.